EVIDENCE OF DARK AVOIDANCE BY PHOTOTROPHIC PERIPHYTIC DIATOMS IN LOTIC SYSTEMS
EVIDENCE OF DARK AVOIDANCE BY PHOTOTROPHIC PERIPHYTIC DIATOMS IN LOTIC SYSTEMS
复制标题
DOI：
10.1111/j.0022-3646.1989.00085.x
复制
发表时间：
1989-03-01
影响因子：
2.9
通讯作者：
HARDY, FJ
中科院分区：
文献类型：
--
作者：
BOTHWELL, ML;SUZUKI, KE;HARDY, FJ
使用位于不列颠哥伦比亚省北汤普森河的快速冲洗、连续流槽检查了人造（聚苯乙烯）基质上的附生硅藻的短期（24-48小时）定植动态。两个平行的槽，一个暴露在自然光下，另一个完全黑暗，在 24 小时内显示出附生生物生物量、叶绿素 a 和藻类分类组成的显着差异。在自然黑暗开始时开始的实验表明，两个海槽夜间的藻类迁移率是相同的。然而，在日出后 2-3 小时内，某些硅藻物种（最著名的是 Hannaea arcus (Ehr.) Patr. 和 Diatoma tenue Ag.）选择性地从人工变暗的槽中迁移出来，但仍留在暴露在自然光下的槽中。更紧密附着的物种，如 Achnanthes minutissima Kutz。在两个光周期的光照剥夺后，还表现出从暗槽的显着迁移。来自粘附、迁移和下沉速率实验的数据表明，细胞从黑暗环境与明亮环境中的不同流出是细胞对浮力或形式阻力调节的结果。
Short-term (24-48 h) colonization dynamics of periphytic diatoms on artificial (styrofoam) substrata were examined using fast-flushing, continuous-flow troughs located on the North Thompson River, British Columbia. Two parallel troughs, one exposed to natural light and the other completely darkened, showed significant differences in periphyton biomass, chlorophyll a, and algal taxonomic composition with 24 h. Experiments which commenced at the onset of natural darkness demonstrated that rates of algal immigration during the night were the same in both troughs. Within 2-3 h of sunrise, however, certain diatom species (most notably Hannaea arcus (Ehr.) Patr. and Diatoma tenue Ag.) selectively emigrated from the artificially darkened trough but remained in the trough exposed to natural light. More closely adhering species such as Achnanthes minutissima Kutz. also showed significant emigration from the darkened trough after light deprivation for two photoperiods. Data from adhesion, emigration, and sinking rate experiments indicate that differential egress of cells from the darkened versus the lighted environments is the result of cellular regulation of buoyancy or form resistance.